diff --git a/code/GridFieldAddNewInlineButton.php b/code/GridFieldAddNewInlineButton.php
index f168f17..fd3578c 100755
--- a/code/GridFieldAddNewInlineButton.php
+++ b/code/GridFieldAddNewInlineButton.php
@@ -140,13 +140,13 @@ class GridFieldAddNewInlineButton implements GridField_HTMLProvider, GridField_S
 			$item  = $class::create();
 			$extra = array();
 
-			if($list instanceof ManyManyList) {
-				$extra = array_intersect_key($fields, (array) $list->getExtraFields());
-			}
-
 			$form->loadDataFrom($fields, Form::MERGE_CLEAR_MISSING);
 			$form->saveInto($item);
 
+			if($list instanceof ManyManyList) {
+				$extra = array_intersect_key($form->getData(), (array) $list->getExtraFields());
+			}
+
 			$item->write();
 			$list->add($item, $extra);
 		}
diff --git a/code/GridFieldEditableColumns.php b/code/GridFieldEditableColumns.php
index 52286c5..612508b 100644
--- a/code/GridFieldEditableColumns.php
+++ b/code/GridFieldEditableColumns.php
@@ -76,13 +76,13 @@ class GridFieldEditableColumns extends GridFieldDataColumns implements
 
 			$extra = array();
 
-			if($list instanceof ManyManyList) {
-				$extra = array_intersect_key($fields, (array) $list->getExtraFields());
-			}
-
 			$form->loadDataFrom($fields, Form::MERGE_CLEAR_MISSING);
 			$form->saveInto($item);
 
+			if($list instanceof ManyManyList) {
+				$extra = array_intersect_key($form->getData(), (array) $list->getExtraFields());
+			}
+
 			$item->write();
 			$list->add($item, $extra);
 		}